How can I use miracast in NixOS?

Help
1

I’m trying the following configuration:

{ pkgs, ... }: 
{
  environment.systemPackages = with pkgs; [
    gnome-network-displays
  ];

  xdg.portal.enable = true;

  xdg.portal.xdgOpenUsePortal = true;
  xdg.portal.extraPortals = [
    #pkgs.xdg-desktop-portal-gtk
    pkgs.xdg-desktop-portal-gnome
    pkgs.xdg-desktop-portal-wlr
  ];

  networking.firewall.trustedInterfaces = [ "p2p-wl+" ];

  networking.firewall.allowedTCPPorts = [ 7236 7250 ];
  networking.firewall.allowedUDPPorts = [ 7236 5353 ];
}

But it’s not working: I can enter the GUI, and the scan is success so I can see my XiaoMi TV listed, but when I select it, an error occurs.

I have tried gnome-network-displays on both Gnome and KDE, but neither of them works. There must be some tricks I have not found yet, hoping for some help.

2

Is it possible miracast is trying to use other, blocked, ports? You could try stopping the firewall (systemctl stop firewall) to see if it then works.

2 Likes
3

I disabled firewall, and still get the following errors (on KDE):

$ gnome-network-displays                                                                                                                      139 ↵
Gtk-Message: 23:07:26.085: Failed to load module "appmenu-gtk-module"

** (gnome-network-displays:56702): WARNING **: 23:07:26.191: Error initing screencast portal: Failed to create portal session (response: 2)

** (gnome-network-displays:56702): WARNING **: 23:07:26.191: Falling back to X11! You need to fix your setup to avoid issues (XDG Portals and/or mutter screencasting support)!
[1]    56702 segmentation fault (core dumped)  gnome-network-displays
4

This looks like a portal issue. KDE and Gnome have their own portals. Have you tried casting from Gnome instead of KDE? Or using a KDE alternative?

Are you using Wayland?

1 Like
5

I have tried both KDE/Gnome, and both X11/Wayland, None of the 4 combinations work.

I’m not sure which step I’m doing wrong, It will be very helpful if someone can share a working nixos configuration.

6

What’s the log output of gnome-network-displays on GNOME Wayland?